A193 B8CLN Class 1D S34751 347LN - ASTM A193/A193M-2020

Grade	A193 B8CLN Class 1D
USA UNS	S34751
Other Names
Corresponding Standard	ASTM A193/A193M-2020 Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
Classification	Austenitic Stainless Steel
Properties	Corrosion Resistance Good Forgability Good Weldability

A193 B8CLN Class 1D Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	N	Nb	More
Minimum Value	0.005	-	-	-	-	17	9	0.06	0.2	Nb≥15C
Maximum Value	0.02	1	2	0.045	0.03	19	13	0.1	0.5	Nb≥15C

• The intentional addition of Bi, Se, Te, and Pb is not permitted

A193 B8CLN Class 1D Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
All Sizes	Solid Solution Treatment	≥515	≥205	≥30	≥50	≤223

• d-diameter of bolt, screw, studs, double-end studs, bars and wire.
• In the table, σs is Rp0.2.

• Class 1 is solution treated. Class 1A is solution treated in the finished condition for corrosion resistance; heat treatment is critical due to physical property requirement. Class 2 is solution treated and strain hardened. Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in sizes over M20 in diameter
• For sizes M20 in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted.

A193B8CLNClass1D Corresponding Standards(Same grade name, different standards)

1	ASTM A193/A193M-2019
	A193 B8CLN Class 1D S34751 347LN
2	ASTM A193/A193M-2020
	A193 B8CLN Class 1D S34751 347LN
3	ASTM A193/A193M-2025
	A193 B8CLN Class 1D S34751 347LN

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!